This page defines the term. The WhatsApp Communities guide covers community limits, the difference with a group and how to create one.
A community bundles groups that share a context, such as a school, a club, a neighborhood, or a customer program, and adds an admin-only announcement group broadcast to every member across the sub-groups.
For businesses, communities suit tight-knit use cases like VIP clubs, beta testers, or local customer groups. Unlike API broadcasts, there are no templates and no segmentation, so they complement opted-in marketing rather than replace it.